Mr. Egghead's Sudoku 400 Giant Size Puzzles, 200 Hard and 200 Extra Hard: The Most Humongous 9 x 9 Grid, One Per Page Puzzles Ever! in Bloomington, MN

Sudoku is a fun game which helps exercise the brain and also gives you a great sense of accomplishment. It is said that it can delay dementia by making your brain work in a different way. This book contains the biggest ever 9 by 9 grid Sudoku puzzles. The gigantic sized puzzle uses the whole letter size page leaving tons of room for penciling in the possibilities. There are 400 puzzles, 200 hard and 200 extra hard, one puzzle per page and solutions at the end of the book. 8.5" X 11"